<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>管理系统</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .container {
            background-color: #fff;
            padding: 30px;
            align-items: center; /* 水平居中对齐 */
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 400px;
            text-align: center;
        }
        h1 {
            color: #333;
            margin-bottom: 20px;
        }
        .button {
            display: inline-block;
            width: 100%;
            padding: 10px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            cursor: pointer;
            text-align: center;
            text-decoration: none;
            margin-bottom: 15px;
            transition: background-color 0.3s ease;
        }
        .button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>管理系统</h1>
        <a href="/index/student" class="button">学生管理系统</a>
        <a href="/index/teacher" class="button">教师管理系统</a>
        <a href="/index/course" class="button">课程管理系统</a>
        <a href="/index/choice" class="button">选课记录管理系统</a>
    </div>
</body>
</html>